Carburetor



March 18 1924.

W. s. GUTHRIE CARBURETOR Filed Feb. 12, 1921 1 N VENT OR.

A TTORNE Y.

Patented Mar. 18, 192% OFFHCE.

WILLIAM S. GUTHRIE, OF TEE/REEL, TEXAS, ASSIGNOR TO MARVEL CARBURETORCOM- PANY, OF FLINT, MICHIGAN, A CORPORATION OF INDIANA.

CABBURETOR.

Application filed February 12, 1921. Serial No. 444,325.

To all'whom it may concern:

Be it known that I, WILLIAM S. GUTH- RIE, a citizen of the, UnitedStates, and residing at. Terrell, in the county of Kaufman and State ofTexas, have invented a new and Improved Carburetor, of which thefllowing is a specification.

This invention relates to devices for heating the intake passages ofinternal combustion engines, especially automotive and ma rine engines,and its primary object is to provide means to accelerate the warming upof certain portions of the intake passage and maintain a good workingtemperature of the same when the engine is running at slow speeds.

In some respects this invention is in the same class with that shown inmy United States Letters Patent No. 1,359,168 dated November 16, 1920,but has advantage over my former structure in having the heater for theintake air so arranged that its effect is less at high speed than at lowspeed. Another advantage resides in having. the hot spot between thecarburetor and the engine so constructed that it has a tendency toretard the fiow of the heavier fuels which usually creep up the walls ofthe intake passage, so that while passing through the hot spot the heavyfuel is vaporized.

Another advantage resides in having a control for the heating apparatusso designed that it may be mounted within reach of the operator of theengine, as on the dash of an automobile where the driver can render theheaters operative or inoperative at will, and when operative, saidheaters may be under joint control with the throttle.

In the drawing, Fig. 1 is a side elevation of an internal combustionengine having an exhaust manifold and an intake manifold embodying theinvention, parts being broken away for clearness. Fig. 2 shows asectional view of the hot spot used between the carburetor and theengine. Fig. 3 shows a modification of the hot spot. Fig. 4: is a planof the swivel connection between the control rod and a valve. Fig. 5 isa section on the line 5-5 of Fig. 4.

Similar reference characters refer to like parts throughout the severalviews.

Referring to the drawing, the engine 1 has an intake passage includingan air cleaner 2, an exhaust heated air chamber 3, a carburetor orcharge forming device usual manner.

4, an exhaust heated chamber 5 (Fig. 2) surrounding the tubular passage5, and an intake manifold 6. The exhaust passage 7 conveys the exhaustgases from the engine to the muffier 8. The annular passage 9 surroundsthe chamber 3, andexhaust gases are supplied to this passage 9 from theexhaust passage 7 by means of the pipes 10 and 11. The pipe 10 alsosupplies exhaust gases to the heater l3 surrounding the chamber 5. Thepipe conveys the exhaust gases from the chamber 13 back into the exhaustpassage 7, and the pipe 16 conveys the exhaust gases from the chamber 9back to the exhaust passage 7. These pipes 15 and 16 may be omitted whenthe smoke and noise is not objectionable. The valve 17 (shown in dottedlines) is positioned in the exhaust passage 7 for the purpose ofaccelerating the flow of the exhaust gases to the chambers or heaters 9and 13, which occurs when the valve 17 is closed, or partly closed. Thescrew 18 and pin 18 provide means for positioning the valve 17 so thatthe effect of the heaters 9 and 13 may be regulated to suit therequirements of the engine. The valve 19 (shown in dotted lines)controls the flow of the exhaust gases to the heater 9, and a valve 20may be employed to close off the flow of the exhaust gases to theheaters 9 and 13 when desired.

The fuel nozzle. 21 in the carburetor 4 supplies fuel to the intakepassage in the The cold air ports 22 arranged on opposite sides to eachother may be employed to admit air to the intake passage from theatmosphere, when desired, to reduce the temperature of the intake air.The air ports 22, as shown, are positioned between the choke valve 23(shown in dotted lines) and the heater 9. A cylindrical shutter 24 isprovided with ports to match the ports 22 as usual, and this shutter maybe moved around so as to close the orts 22. The screw 25 provides meansfor ho ding the shutter in position.

The carburetor 4 is provided with the usual throttle 27, shown in dottedlines, and the rod 28 connects the throttle with the valve 19. The rod29 connects the valves 17 and 19, and the rod 30 connects the valve 17with the dash control device 31. The adjustable collars 32 and 33 arefastened to t e rods 28 and 30 by means of set screws 34 and 35. Thecoil spring 36 tends to close 7 the valve 17, and at the same time thisspring tends to open the valve 19.

The rod 30 connects with the lever 17" of the valve 17 by means of aswivel connection, better shown in Figs. 4and 5. This swivel connectionconsists of a collar 37 having a round stem 38 extending loosely througha hole in the lever 17*, and a cotter pin 39 prevents the disengagementof the collar 37 with the lever 17*. The collar 37 is freely slidable onthe rod 30. The rod 28 is connected to the valve lever 19 in a mannersimilar to that just described.

The chambers 3 and 5 am preferably corrugated, so that a short chamberwill have a relatively large heated surface. This corrugated wall isalso desirable in the chamber 5 for trapping the heavier fuels flowingup the walls of the intake passage above the carburetor. Upon reachingthe corrugated section, the flow of the heavy fuels is retarded becauseit flows into the wrinkles out of the air current, and while moving upthe highly heated corrugated walls, the heavy fuel is vaporized. Theexhaust gases flowing through the heater 13 highly heat the thincorrugated section 5 of the intake passage. The vapor from the heavyfuel flows up through the ports 5 to the interior of the tube 5.

It is known that the heavy fuels crawl or creep up the walls of theintake passage to the engine cylinders and finally reach the crank casewhere the lubricating oil is stored, and materially dilute the oil andimpair the lubricating qualities thereof.

The corrugated hot spot above described is of great value because itvaporizes the heavier fuel and utilizes the same in developing power,which not only increases fuel economy, but also prevents the lubricatingoil being diluted.

It is preferred to have the corrugated section made of sheet metal suchas thin copper so that the heat effect will be as great as possible whenthe engine is running at low speed. Acceleration of flow of exhaustgases to the heaters 9 and 13 is especially desirable at low enginespeeds in order to heat them properly for the best vaporization of, theheavier fuels.

The throttle 27 is connected with the valves 17 and 19 in such mannerthat when the throttle is partially closed for slow speeds of theengine, the valve 17 will be closed, or partly closed. to retard theflow of the exhaust gases throughthe exhaust passage 7 and thereby causethe exhaust gases to flow very rapidly to the heaters 9 and 13. Thevalve 19 at this time will be open to permit the exhaust gases to flowfreely to the heater 9.

Upon opening the throttle 27 for high speeds of the engine, the valve 19will close to retard the flow of exhaust gases to the air heater 9, andthe valve 17 will'simultaneously open to permit the exhaust gases toflow freely down through the pipe 7.

From the foregoing description it will be apparent that the intake airis not heated to such an extent as to very materially impair the maximumpower of the engine. It will also be apparent that a hot spot similar tothat described and of adequate size may be employed to properly vaporizethe heavy fuel without very materially expanding the in-going charge.

Tn hot climates, or when lighter fuel is used, it may be desirable toclose off the heating effect of the heaters, so I have provided acontrol device which may be fastened to the dash 41 of an automobile theshaft of the valve similar to that shown The swivel connections betweenthe rods 28 and 30 as above described provide means for opening thevalve 17 by pulling out the dash control button 42 without impartingmovement to the throttle 27. and make it possible to operate thethrottle without imparting movement to the valves 17 and 19. The dashcontrol button 42 is held in position by means of a spring 43 pressingthe ball 44. into the grooves 45.

A valve 46 may be provided to prevent the exhaust gases flowing to theair heater 9 without making the heater or hot spot 13 inoperative. Thevalve 20 in the pipe 10 may be closed to prevent exhaust gases flowingto the heaters 9 and 13. and valves 47 and 48 may be placed in the pipes15 and 16 to prevent. exhaust gases entering these pipes from below,when the heaters are not in operation. The valves 47 and 48 may be heldin position by any known means.

A thin metal chamber 50 having an enlarged area at the point where theheat is applied, as shown in Fig. may be substituted for the chamber 5.In a chamber of this shape, the heavy fuels creeping up the walls of thepipe below it pass out of the draft into the chamber 50 where their flowis slowed down. and in moving slowly over the hot walls of the chamber50. the heavy fuels are vaporized and pass up through the ports 51.Sometimes a straight tubular chamber may be made of metal thin enough tovaporize the heavy fuel when suflicient exhaust heat is applied to thejacket surrounding the same.

In operation, air enters the ports 49 of the air cleaner 2, and flows upthrough the chamber 3, where at slow speed it is heated,

fuels pass up through the ports and flow to the intake pipe 6 with theother fuel and finally pass into the cylinders of the engine. A rod 53may be connected to the valve 23 for limiting or choking downthe-infiowing air in the usual manner. I

The valves 17 and 19 may be omitted sometimes, and the valve 20 may beconnected with the throttle 27 in a manner similar to the connectionbetwen the throttle and the A valve 19. Again, the valves 17, 20 and 46ling'device other'than the throttle, and the;

may be omitted, leaving the valve 19 under control of the throttle. Thevalves 47 and 48 may also be eliminated when desired. When the valve 19is eliminated, a rod of greater length than shown may be employed toconnect the valve 17 directly with the throttle 27. In fact, a number ofdesirable combinations of the various valves and con trols may be hadwithin the scope of the present invention.

The air cleaner 2 as shown merely illustrated a suitable way of cleaningthe air,

of the exhaust ases without including the air' heater 9. r a heater? forvaporizing the heavy fuels similar to that shown and described may beused without any controltube 5 may be omitted with good results, theintensity of the heat making it possible to vary the design more ,or.less. It may also be desirable under certain conditions to use aVenturi shaped tube in place of the 7 tube 5.

The valve 15 shown in the above mentioned patent is very similar to thevalve 17 shown ln-the present case, and while in the present case thethrottle is shown in control of this valve, it will; be apparent that Imay sometime wish to employ someother control for thi valve similar tothat shown in said patent.

The details of construction may vary widely from that shown in thedrawings without departing from the spirit of my invention as set forthin the following claims.

I claim z 1. In combination with an internal combustion engine, of; anintake passage communicatin with said engine, a heater for heating saidintake passage, means for supplying exhaust gases from the engine tosaid heater, a throttle for the intake passage, a valve to vary the flowof exhaust gases to said heater, means for jointly operating saidthrottle and said valve, and addi tional means for controlling saidvalve so,

that the throttle may be operated without imparting movement to saidvalve.

2. In combination with an internal combustion engine, of an intakepassage communicatin heating said intake passage, means for supplyinexhaust gases from the engine to said eater, a throttle for the intakepassage, a valve to vary the flow of exhaust gases to said heater, meansfor jointly operating said throttle and said valve, additional means forcontrolling said valve so that the throttle may be operated withoutimparting movement to said valve, and 'a spring tending to close saidvalve. 1

3. In combination with an internal combustion engine, of an intakepassage. communicating with said engine, means for supplying fuel andair to said intake pasage,

with said engine, a heater for y means for heating said intake passagean- I terior to said fuel supply means by the exhaust gases from saidengine, means for accelerating the flow of exhaust gases to said heatingmeans, a valve anterior to said heating means to retard the flow ofexhaust gases to said heating means, a throttle for the intake passage,and means for jointly operating said throttle and said valve.

4:. In combination with an internal combustion engine, of an intakepassage communicating with said engine, means for supplying fuel and airto said intake passage,

means for heating said intake passage between said fuel supply means andthe engine, means for heating said intake passage anterior to said fuelsupply means, means for supplying exhaust gases from said engine to bothof said heating means, a valve to accelerate the flow of exhaust gasesto both of said heating means, an auxiliary air inlet device for saidintake passage anterior to the fuel supply means, a throttle in theintake passage beyond said fuel supply means, and means controlling saidauxiliary air inlet device independent of said throttle. 5. Incombination with an internal combustion engine, of an intake passagecommunicating with said'engine, means for supplying fuel and air to saidintake passage, means for heating said intake passage between said fuelsupply means and the engine, means for heating said intake pissageanterior to said fuel supply means, means for supplying exhaust gasesfrom said engine to both of said heating means, a valve anterior to thesecond mentioned heating means to retard the flow of exhaust gasesthereto, a throttle, and means for jointly operating said valve and saidthrottle.

6. In combination with an internal combustion engine, of an intakepassage communicating with said engine, means for supplying fuel to saidintake passage, a heater for heating the intake passage between saidwithout imparting movement to said valve.

7. In combination with an internal combustion engine, of an intakepassage and an exhaust passage communicating with said engine, means forsupplying fuel and air. to said intake passage, means for heating saidintake passage anterior to said fuel supply, a conduit connecting saidexhaust passage with said heating means, an air inlet device betweensaid heating means and said fuel supply means for regulating thetemperature of the air supply, a valve controlling the circulation ofexhaust gases to said heating means, a throttle for the intake passage,and means for jointly operating sa1d valve with said throttle to preventcirculation of the exhaust gases to reduce the heating eflect of saidheating means when the throttle is open.

8. In combination with an internal communicating with said engine, meansfor supplying fuel to said intake passage, a heater for heatin theintake passage between said fuel supp y means and the engine, saidheater having a corrugated wall forming a partition between the heaterand said intake passage, a heater for heating said intake passageanterior to said fuel supply means, means for supplying exhaust gasesfrom the engine to said heaters, a valve to vary the flow of the exhaustgases to both of said heaters, a throttle for said intake passage, meansfor jointly operating said throttle and said valve, and additional meansfor operating said valve so that the throttle may be operated withoutimparting movement to said valve.

9. In combination with an internal combustion engine, of an intakepassage conimunicating with said engine, means for supplying fuel tosaid intake passage, a heater for heating said intake passage betweensaid fuel su ply means and the engine, a heater for eating said intakepas means for supplying exhaust gases from the engine to said heaters, avalve to vary the flow of exhaust gases to both of said heaters, athrottle for said intake passage, means for jointly operating saidthrottle and said valve, and additional means for controlling said valveso that the throttle may be operated Without imparting movement to saidvalve.

10. In combination with an internal combustion engine, of an exhaustpassage and an intake passage communicating with said engine, a heaterfor heating said intake passage, means for supplying exhaust gases fromsaid exhaust passage to said heater, a throttle controlling the flow offluid through said intake passage, a valve to varythe flow of exhaustgases to said heater, means for jointly operating said throttle and saidvalve, and additional means for controlling said valve so that saidthrottle may be operated without imparting movement to said valve. 11.In combination with an internal combustion engine, of an exhaust passageand an intake. passage communicating with said engine, a heater forheating said intake passage, means for supplying exhaust gases from saidexhaust passage to said heater, a throttle controlling the flow of fluidthrough said intake passage, a valve to vary the flow of exhaust gasesto said heater, means for jointly operating said throttle and saidvalve, additional means for controlling said valve so that said throttlemay be operated without imparting movement to said valve, and a springtending to actuate said valve.

12. In combination with an internal combustion engine, of an exhaustpassage and an intake passage communicating with said engine, a heaterfor heating said intake passage, means for supplying exhaust gases fromsaid exhaust passage to said heater, a throttle controlling the flow offluid through said intake passage, a valve anterior to said heater toretard the flow of exhaust gases o v said heater, means for jointlyoperating said throttle and said valve, and a valve in said exhaustpassage to accelerate the flow of exhaust gases to said heater.

13. In combination with an internal com bustion engine, of an exhaustpassage and an intake passage communicating with said engine, means forsupplying fuel to said intake passage, a heater for heating said in-.

takepassage between said fuel supply means and the engine, a heater forheating said in take passage anterior to said fuel supply means, meansfor supplying exhaust gases from said exhaust passage to both of saidheaters, a valve in said exhaust passage to accelerate the flow ofexhaust gases to both of said heaters, a throttle for said intakepassage, means for jointly operating said throttle and said valve, meansto regulate the temperature of the air supply, and means independent ofsaid throttle for controlling said latter means.

1%. In combination with an internal combustion engine, of an exhaustpassage and an intake passage communicating with said engine, means forsupplying fuel to said intake passage, a heater for heating said intakepassage between said fuel supply means and the engine, a heater forheating said intake passage anterior to said fuel supply means, meansfor supplying exhaust gases from said exhaust passage to both of saidheaters, a valve in said exhaust passage to accelerate the flow ofexhaust gases to both of said heaters, a throttle for said intakepassage, a valve to retard the flow of exhaust gases to the secondmentioned heater, and means for jointly operating said throttle and saidvalves.

15. In combination with an internal combustion engine, of an exhaustpassage and an intake passage communicating with said engine, means forsupplying fuel to said intake passage, a heater for heating said intakepassage between said fuel supply means and the engine, a heater forheating said intake passage anterior to said fuel supply means, meansfor supplying exhaust gases from said exhaust passage to both of saidheaters a valve in said exhaust passage to accelerate the flow ofexhaust gases to both of said heaters, a throttle for said intakepassage, a valve to retard the flow of exhaust gases to the secondmentioned heater, means for jointly operating said throttle and saidvalves, and additional means provided to permit said throttle to beoperated without imparting movement to one of said valves. 16. Incombination with an internal combustion engine, of an exhaust passageand an intake passage communicating with said engine, means forsupplying fuel to said intake passage,a heater for heating said intakepassage between said fuel supply means and the engine, a heater forheating said intake passage anterior to said fuel supply means, meansfor supplying exhaust gases from said exhaust passage to both of saidheaters, a valve in said exhaust passage to accelerate the flow ofexhaust gases to both of said heaters, a throttle for said intakepassage, a valve to retard the flow of exhaust gases to the secondmentioned heater, means for jointly operating said throttle and saidvalves, and additional means controlling said valves so that saidthrottle may be operated without imparting movement to said valves.

17. In combination with an internal combustion engine, of, an intakepassage communicating with said engine, means for supplying fuel to saidintake passage, a chamber partitioned ofi from said intake passage andhaving an inlet from said intake passage between said fuel supply meansand said engine, an outlet from said chamber to said intake passage,said outlet being separate and distinct from said inlet, a heater forheating said chamber, means for supplying exhaust gases from said engineto said heater, a valve to accelerate the flow of exhaust gases to saidheater, a throttle, and means for jointly operating said valve and saidthrottle.

18. In combination with an internal combustion engine, of an intakepassage communicating with said engine, means for supplying fuel to saidintake passage, a chamber partitioned ofl from said intake passage andhaving an inlet from said intake passage between said fuel supply meansand said engine, an outlet from said chamber to said intake passage,said outlet being separate and distinct from said inlet, a heater forheating said chamber, means for supplying exhaust gases from the engineto said heater, a valve" to accelerate the flow of exhaust gases to saidheater, a throttle for said in take passage, and means for jointlyoperating said throttle andsaid valve.

19. In combination with an internal combustion engine, of an intakepassage communicating with said engine, means for supplying fuel to saidintake passage, a chamber communicating with said intake passage betweensaid fuel supply means and said engine, a heater for heating saidchamber, means for supplying exhaust gases from the engine to saidheater, a valve to vary the fiow of exhaust gases to said heater, athrot- 7 tie for said intake passage, means for jointly operating saidthrottle and said valve, and additional means controlling said valve sothat said throttle may be operated without imparting movement to saidvalve.

20. In combination with an internal combustion engine, of an exhaustpassage and an intake passage communicating with said engine, a throttlefor said intake passage,

means for supplying fuel and air to said intake passage, an air heaterfor heating said intake passage anterior to said fuel supply I 15 saidintake passage, a heater for heating saidintake passage anterior to saidfuel suptea ply means, means for supplying exhaust gases to said heater,a valve to vary the flow of exhaust gases to said heat a t.

valve to retard the flow of exhaust gases to said heater, a throttle forthe intake passage, means for jointly operating said throttle and saidvalves, and additional means controlling said valves so that saidthrottle may be operated Without imparting movement to said valves.

22. In combination With an internal combustion engine, of an exhaustpassage and an intake passage communicating with said engine, means forsupplying fuel .and air to said intake passage, a heater for heatingsaid intake passage anterior to said fuel supply means, means forsupplying exhaust gases from the engine to said heater, a valve in saidexhaust passage to vary the heating elfect of said heater, a valve toretard the flow of exhaust gases to said heater, a throttle for theintake passage, means for jointly operating said throttle and saidvalves.

Signed at Detroit, Michigan, this 10th day of February, 1921.

WILLIAM S. GUTHRIE.

